RFI - 25_06_23_AIA_ SLa_3 Allambi Rise_V2

9.8     MITIGATION MEASURES
Remediation measures can be undertaken to limit and reduce any negative effects that may
occur. Where suitable, the retained trees’ TPZ areas are to be improved to provide a more
favourable and beneficial growing environment for the trees’ roots.

Where the soil levels are required to be raised a sandy loam is to be used. This will improve
drainage and allow for gaseous exchange. Trees can adapt to low levels of Fill being placed
over the existing ground if undertaken with the correct material. In some cases, this additional
medium can also provide ideal rooting conditions for feeder roots and a beneficial food source
for the tree.

The following recommendations could be taken to improve an existing plant’s vigour and will,
in turn, benefit the plant’s health, safety, and the amenity that it provides and can be
incorporated with the project landscaping details.

Where groundworks are carried out adjacent to or encroaching into the TPZ areas, the
following mitigation measures and procedures should be implemented where deemed
appropriate and should be supervised by Consult Arborist.

•     Where possible, the excavated ground, including the cut roots, will be covered/backfilled
      with quality topsoil locally sourced or a sandy loam/river sand with low organic matter, as
      guided by AS 4419—2003. Australian Standard™ Soils for landscaping and garden use.
•     An application of seaweed-based soil conditioner/plant food can be applied to the topsoil
      as per the manufacturer’s guidelines. Monthly applications are recommended for the
      duration of the project.
•     When required supplemental watering with a water cart or sprinkler system can be used
      to retain adequate moisture levels in the soil.
•     The Project Arborist is to advise and oversee all mitigation measure works being
      undertaken on retained trees.

All tree works and tree protection measures are to be guided by industry best practices and
the relative Australian Standards, which include but are not limited to:
 • Australian Standards AS4970-2009 Protection of trees on development sites
 • Australian Standards AS4373-2007 Pruning of amenity trees




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